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Evening all

A few weeks ago we were doing an Eicr and were getting dead shorts on every circuit between neutral and earth. In the end it was believed that the fault might actually stem from the incoming earth. I understand you will get a short if it was tncs but not usually tns. However the matter was further investigated by an electricity provider and they said that although it is tns they often make supplies tncs further down the line and so you will get these readings unless you disconnect the neutral bar etc. My question is for example you tested a commercial premises in the same situation and are unable to isolate an entire board at once, how would you ever get readings between neutral and cpc for any circuit.

(im still training currently and it's just something that's been on my mind)
 
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